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Finding the Fourth Proportional to 602.91, 832.31 and 390.47

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Solution

The fourth proportional to 602.91, 832.31 and 390.47 is: 539.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.91 : 832.31 = 390.47 : x
  2. Step 2: Convert to fraction form
    602.91/832.31 = 390.47/x
  3. Step 3: Cross multiply
    602.91x = 832.31 × 390.47
  4. Step 4: Simplify right side
    602.91x = 324,993.77
  5. Step 5: Solve for x
    x = 324,993.77/602.91
  6. Step 6: Final answer
    x = 539.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.